Collet surface structure for a hydraulic high-speed press

Details Collet surface structure for a hydraulic high-speed press Collet surface structure for a hydraulic high-speed press

1989-10-17

1991-06-25

Jones, David

Metal deforming

With means to drive tool

With means to selectably control movement of tool

72446, 7245304, 72454, B21J 746

Patent

active

050256521

ABSTRACT:
A collet surface structure is provided for a high-speed hydraulic press having collet interlock in order to eliminate leakage of oil into the clamping region. Furthermore, the formation of a harmful hydrostatic film thickness from the lubricating-oil film between the pressure rods and the collets is prevented, since the oil is immediately forced away due to the high clamping pressure between the clamping faces. These high clamping pressures result from the extremely short space of the lubricating-oil elimination grooves and the large capacity of the grooves. Thus, the oil-eliminating grooves are made large enough to eliminate reliably a hydrostatic oil film of at least 0.1 mm. This regularity is independent of the clamping diameter of the collet.

REFERENCES:
patent: 3735631 (1973-05-01), Schmoll et al.
patent: 4123929 (1978-11-01), Huydts
patent: 4291571 (1981-09-01), Claussen
patent: 4809535 (1989-03-01), Ellis

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